A Vet examining him is what needs to happen. You might check with local shelter/SPCA, they may have some assistance programs available. Another possibility, talk to your Vet, or a local one, to work out a payment plan.
One is a wound. The other is a nipple or spot. Make up saline solution in a squeezy bottle n rinse wound morning and night. I wouldnt go to a vet for a skin wound this minor and clean. The lint coming out of wound. It aint the twighlight zone. Thats muck that got into the wound. Minor minor skin issue. Like you wanting to see a dr for a pimple.